Voltage: 110VThis SOHO-PBX SP-208 system is an ideal telephone system for small offices and home offices.Easy to install and use.Direct or Indirect Dialing Mode.Automated Attendant Mode AND Operator mode.Call hold, transfer,Caller ID (FSK/DTMF/Bellcore).Three-way conferencing.Intercom call--Make internal calls from any extension.Facsimile supported--Any extension can hook up a fax machine or a PC to send or receive facsimiles.Incoming call alertToll restriction scheme--Long Distance or International Direct Dialing can be disabled on a per extension basis.Secretary assisted dialingLimit CO line call durationPower failure tolerantDo not disturb--Extension with 'do not disturb' turned on will not ring.No response from caller under Auto-attendant mode.CO line ports can be disabled or enabled individually.Flexible Ring delay on incoming calls.Flexible extension number plan.Recording Outgoing Greeting Message (OGM). Playback OGM--User can listen to the recorded OGM or the on-hold music.CO Line ringing assignment.